[PATCH] drm/cma-helper: NULL dereference calling drm_gem_cma_prime_get_sg_table()

[Dan Carpenter]

This funciton is only called from drm_gem_map_dma_buf().  It's supposed
to return error pointers on failure and returning a NULL pointer will
lead to a NULL dereference.

Fixes: 78467dc5f70f ("drm/cma: add low-level hook functions to use prime 
helpers")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c 
b/drivers/gpu/drm/drm_gem_cma_helper.c
index 80a5115c3846..f8a9c09efb87 100644
--- a/drivers/gpu/drm/drm_gem_cma_helper.c
+++ b/drivers/gpu/drm/drm_gem_cma_helper.c
@@ -436,7 +436,7 @@ struct sg_table *drm_gem_cma_prime_get_sg_table(struct 
drm_gem_object *obj)
 
        sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
        if (!sgt)
-               return NULL;
+               return ERR_PTR(-EINVAL);
 
        ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr,
                              cma_obj->paddr, obj->size);
@@ -447,7 +447,7 @@ struct sg_table *drm_gem_cma_prime_get_sg_table(struct 
drm_gem_object *obj)
 
 out:
        kfree(sgt);
-       return NULL;
+       return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(drm_gem_cma_prime_get_sg_table);
 
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